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Despite the fact that the contents of items on the Raven's Progressive Matrices have little similarity to the content of subjects taught in school, the correlation coefficients between IQ scores and achievement test scores have been estimated to be about 0.5. Six groups of 20 students were randomly selected from the first, second, and third grades of urban and rural guidance schools in Shahrebabak, one of Kerman province cities. Raven's progresive matrices intelligence test was administerred. The data on the child's grade point average, his father's occupation and education were also obtained. The results showed that there are significant correlations among the child's IQ, his grade point average, and his father's occuparion was not significant. The analysis of regression showed that the child's IQ is the best predictor of his grade point average and that the addition of father's level of education to the regression equation does not signifiacntly increase the power of prediction. An expectancy table was obtained, according to which the probability of grade point average being below 15 can be predicted from the child's IQ score.

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